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I have 2 servers, one running my websites (LAMP) and a second win/IIS based server running smartermail. I need all outgoing email from my websites to be sent via Smartermail on the win/IIS server, but without the need for me to add credentials to the email script on each website.
So, is it possible to use Smartermail as a relay without the need for authentication but limited to only whitelisted servers IP's ? This way only my LAMP server can send unauthenticated emails via Smartermail?